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Motion Of Bodies In Contact MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

Quick Facts

Motion of Block in Contact is considered one the most difficult concept.
4 Questions around this concept.

Solve by difficulty

A block of mass m is connected to another block of mass M by a spring ( massless ) of spring constant K . The blocks are kept on a smooth horizontal plane.Initially the blocks are at rest and the spring is unstretched Then a constant force F starts acting on the block of mass M to pull it. Find the force of the block of mass m.

A

$\frac{M F}{(m+M)}$

B

$\frac{m F}{M}$

C

$\frac{(M+m) F}{m}$

D

$\frac{m F}{(m+M)}$

Three blocks A, B and C, of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is:

A

6 N

B

8 N

C

18 N

D

2 N

Concepts Covered - 1

Motion of Block in Contact

$Use\:F_{net}=ma$

$a=\frac{F_{net}}{m_{1}+m_{2} }$

When 2 Blocks are in Contact

$F-f=m_{1}a$

$f=m_{2}a$

$a=\frac{F}{m_{1}+m_{2}}$

$f=\frac{m_{2}F}{m_{1}+m_{2}}$

When 3 Blocks are in Contact

$Use\:F_{net}=ma$

$a=\frac{F}{m_{1}+m_{2}+m_{3}}$

$f_{1}=\frac{(m_{2}+m_{3})F}{m_{1}+m_{2}+m_{3}}$

$f_{2}=\frac{m_{3}F}{m_{1}+m_{2}+m_{3}}$

Study it with Videos

Motion of Block in Contact

Study other Related Concepts

Motion Of Bodies In Contact Current Topic

Common Forces In Mechanics

Equilibrium Of Concurrent Forces

Newton’s First Law Of Motion

Linear Momentum

Newton's Laws Of Motion

Acceleration Of Block On Horizontal Smooth Surface

Acceleration Of Block On Smooth Inclined Plane

Motion Of Bodies In Contact

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